Malicious PDF — malware analysis report

Static analysis result for SHA-256 a391629c15c36c99…

MALICIOUS

PDF

73.6 KB Created: 2020-08-01 22:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61ad7d6f19c2f3295ca21f1d8ca51c7 SHA-1: fbaef7635b6ea01d4c0648b38fe88352054e135d SHA-256: a391629c15c36c998f96f6a12e0b03935c5a390b395d03c8d32038c76c2983e8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The sample is a PDF file flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.com/pify?keyword=java+collections+sort, which is part of a redirector infrastructure. The document body, though heavily obfuscated, contains this URL, suggesting it's the intended lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=java+collections+sort
    • http://files.chatteriemainecoonroswell.com/uploads/1/3/1/4/131407164/munodigadomosugafo.pdf
    • http://files.greenwoodtoylibrary.org.au/uploads/1/3/1/8/131856330/3948853.pdf
    • http://files.7thgradescienceworld.com/uploads/1/3/0/8/130813144/kagawan.pdf
    • http://files.yoursalwayspdx.com/uploads/1/3/2/8/132815742/f10666d7793.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/dezinedutudekebup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1343/0686/files/fexumutaga.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/50810610263.pdf
    • https://cdn.shopify.com/s/files/1/0431/4592/0669/files/nagesasowakotirikelevimok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/lataneza.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/kawosakilirugulesalagas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/fozadodozadovenozivez.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0604/files/pifazexogugozelowize.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/sepegogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/58301166878.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/tewuvi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3985/7563/files/23353893415.pdf
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/76923523532.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca88.bin
d2da0f1a699d3235c3911993471830a7d34b6b71374841e53ce0a1b0a28b51d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 4632 bytes
font_01_sfnt_off0000da44.bin
0a4c22d83ba5c01c9b678c56352cb03504827ad52e309ae391f727e4ec869b61
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 15556 bytes
font_02_sfnt_off00010b0a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 4324 bytes